Nine-Eleven, the destruction of the World Trade Center Towers and the attack on the Pentagon, which occurred on September 11, 2001, changed the course of world history.
It gave rise directly to US-led wars on Afghanistan and Iraq, which together, resulted in 370,000 battlefield deaths, 6,800 of the victims being US soldiers. Including all disability claims, US forces suffered almost one million casualties.
The war on Iraq led directly to the emergence of ISIS that, with its war-spawned jihadi predecessors, has killed or expelled virtually the whole of Iraq's 1.5 million Christians.